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On Fri, 2009-11-13 at 19:01 +0000, Alex Queiroz wrote: > Hallo, > > On 11/13/09, Thomas Bushnell BSG <tb@xxxxxxxxxx> wrote: > > So what? Are we now making srfi's have an inelegant interface because > > some implementations implement standard scheme poorly? > > > > Implementing integer sets is a bit difficult with "elegant" Scheme. We don't need integer sets. Scheme does not specify any lambda syntax other than "this is the minimum number of parameters" and "there may be extra parameters". The only meaning I can understand for "arity" is with reference to the formals lists in lambda expressions. Some other folks seem to have a rather more metaphysical understanding in mind, but I can't quite figure out just what they mean by it. In any case, multiple return values is a perfectly well defined part of scheme, and it's easy to implement efficiently. There are implementations which can't be bothered, just as there are some which can't be bothered to implement call/cc efficiently. But that doesn't mean we should start specifying language features in such a way as to *require* an inelegant expression, because the elegant one is not implemented efficiently by badly written implementations. Thomas